Harrow.



A. A GUERNB.

HARROW.

APPLICATION FILED FEB. 7, 1914.

Patented July 14, 1914 THE NORRIS PETERS CO.v PHOTO-LITHQ. WASHINGTON. 1), LI

ALFRED A.,GUERNE, OF KALAMAZOO, MICHIGAN.

HAIR/ROW.

Specification of Letters Patent.

Patented July 14, 1914;.

Application filed February 7, 1914. Serial No. 817,100.

To all whom it may concern Be it known that I, ALFRED AQGUERNE, a citizen of the United States, residing at Kalamazoo, Michigan, have invented certain new and useful Improvements in IIarrows, of which the following is a specification.

This invention relates to improvements in harrows.

The objects of this invention are: First, to provide an improved track harrow which can be readily used so as to render the wear on the harrow teeth uniform. Second, to provide in a harrow an improved means for securing the harrow teeth.

Further objects, and objects relating to details and economies of construction and operation, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing forming a part of this specification, in which:

Figure I is a perspective view of a structure embodying my invention. Fig. II is a top plan view of the same on a reduced scale. Fig. III is a sectional view taken on the line 3-3 of Fig. I and showing in detail the means for fastening the harrow teeth to the angle bars. Fig. IV is a sectional view taken on the line H of Fig. III.

In the drawing similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Considering the numbered parts of the drawing, 1 designates the angle bars secured together to form an equilateral triangle. At the center of each of these bars I secure brace rods 2 which extend to the centers of the adjacent bars. These brace rods form an equilateral triangle within the first triangle and serve to strengthen the harrow structure. The angle bars 1 are secured together at their ends by means of the brace plates a, and at each angle of the triangle is provided an attaching eye 3 so that the draft may be attached to the harrow at any one of these three points. Each of these angle bars is provided with a plurality of harrow teeth 5 secured thereto, and extendingin a downward direction relative to said angle bar. Each of these teeth projects through an opening in the bottom of the bar and the upper end thereof is held against the top of the bar by means of an eye bolt 6, the threaded shank of. which extends through an opening in the side of the angle bar and embraces the tooth 5. The teeth are drawn into gripping contact with the angle bar by screwing up'the nut on said shank.

Assuming that the draft is attached at the eye at the top of Fig. I, the two upper sides of the triangle would present harrow teeth inclined alittle bit to the side relative to the direction in which the harrow is drawn, so that the-edge of the tooth rather than'the point comes in contact with the earth. As a result these teeth have more of a scraping and cutting action than a digging action and tend to scrape the surface of the ground as they are drawn over it. The teeth on the rear bar of the harrow project rearwardly from the said frame and have a compacting action on the surface of the ground and serve to break up the clods as they pass over them.

It will be observed that the wear on the teeth will not be uniform in that but one edge of the tooth is exposed to contact with the ground. However, by hitching the team to the different attaching eyes at different times, different edges of the teeth will be brought into use and as a result the user will be enabled to get the greatest wear out of the harrow by using it so as to wear the teeth uniformly on all sides.

I have also provided a very eflicient fastening means for the harrow teeth. The tooth bears against the top of the angle bar and also against the edge of the opening 8 and the eye bolt which embraces the tooth between these points exerts a lateral pressure upon the tooth, springing it slightly at the center so that it is brought into binding engagement with the bar at these two points when the nut on the shank of said bolt is drawn up, thus it is possible to secure a very effective gripping of the harrow tooth, and at the same time it is very easy to release the tooth in order to change it whenever desired.

I am aware that this particular embodiment of my invention is susceptible of considerable variation and therefore I do not wish to be restricted to it. I have found, however, that this particular form is advantageous and to be preferred, and I therefore desire to claim the same specifically as well as broadly, as indicated by the appended claims.

Having thus described my invention, what I claim as new and-desire to secure by Let ters Patent, is: I

1. In a harrow, the combination of three L-shaped angle bars united to form an equilateral triangle, draft eyes provided at each angle thereof, a plurality of harrow teeth secured to said angle bars and downwardly and outwardly inclined relative thereto, each tooth engaging the top edge of the angle bar and passing through an opening in the bottom thereof, eye bolts extending through openings in the upright member of the angle bar and embracing each tooth between its points of engagement with the angle bar, all coacting substantially as described for the purpose specified.

'2. In a harrow, the combination of three -L-sha-ped angle bars in the form an equiteeth releasably secured to said angle bars and downwardly and outwardly inclined relative thereto, all coacting substantially as described forthe purpose specified.

3. In a harrow, the combination of three bars united to form an equilateral triangle, draft eyes provided at each angle thereof and a plurality of harrow teethlreleasably secured to said'bars and downwardly and outwardly inclined relative thereto, all coactin'g substantially purpose specified.

In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses. I Y ALFRED A. GUERNE. [L. s] lVitnesses:

O. B. Dns JA'RDINs, M. L. GLAscow.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents. Washington, D. G.

as described for they 

